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Hello,
I've read many things about ODAC, I've build O2 and I like very much.
But if this is a DIY forum I'd like to have more info about ODAC like schematic and so on.
At the moment for me ODAC is only a commercial product like many others.
I think that I'll buy one but is like to buy a Iphone in a shopping centre.
Ciao
Guglielmo
Italy

Ok perfect.
At the moment I'm using ES9023 build on a proto board connected to SDTrans in sincronous mode with I2s and MCLk and in the future I'd like to tweak your board if possible to use in the same way and compare USB with SD card reader.
Ciao
Guglielmo

ESS Technology datasheets are readily available from their distributors, you only have to ask. Just don't ask me for them.

GFEC requires a multi-page, non-disclosure agreement be signed before you can receive any datasheets for their Tenor products. Since I had to sign this agreement to receive the information needed, including programming tools, I felt it wise to ask GFEC it is was acceptable to release the schematic.
NOTE: The programming tools are still restricted and cannot be released.

Generally you will not find schematics of commercial products published so as to keep designs from being cloned. Once the ODAC schematics, with component values, are published it will be easy to duplicate (off shore)

The 'secret' to the ODAC's performance is in the layout and choice of components. NwAvGuy spent hours upon hours tweaking component choices. To achieve the datasheet performance specifications is quite an achievement. To do so with a USB bus powered device with a restrictive footprint is remarkable. The devil is in the details and having the proper testing equipment.

I'm certain that once this thing starts getting copied by the Asia-shotgun-suppliers they're going to switch to the TE8802L, add a seperate clock and rework the thing into some frankenDAC that nobody recognizes... and it won't measure nearly as well either.

Hey... any thought of having a version with the GFEC and ESS components prepopulated and programmed, and the rest of the stuff in a kit for us to try our hand at SMD soldering? I'm sure we're a year away from that (if it ever happens), but I can dream, can't I?

The only thing the TE8802L will bring to the table is extended sample rates. Since the DAC is working at spec there is no room for 'improvement'.

If you want to burn your fingers on SMD and DAC's you can look at the open source audio-widget USB5102. Plenty of chippy things and little parts you can lose as you populate the board. The USB8741, base on the WM8741, is still a few weeks away but will have enough parts to keep any solder sniffer happy.

My current DAC/Amp uses the same USB interface as the ODAC, so maybe I'm just looking for different. It is cool that the TE8802L can be programmed to UAC1 and also includes 88.2kHz. So far, I've only seen two people in all the various forums who have requested the 88.2kHz functionality.

I don't care. What I am stewing about though is what enclosure to use and how to best mount it. I think I'll be using mounting pegs from the bottom since I can't seem to find anything that is dimensionally perfect for a slide-in.